\(\dfrac{x}{-5}=\dfrac{12}{20}\)
\(\dfrac{-x}{5}=\dfrac{12}{20}\)
\(-x=\dfrac{\left(12\cdot5\right)}{20}\)
\(-x=\dfrac{60}{20}\)
\(-x=3\)
\(x=-3\)
Tìm x, biết:
a) \(\dfrac{3}{4}x\) - \(\dfrac{7}{12}\) = \(\dfrac{5}{6}\) - \(\dfrac{2}{3}\)
b) -\(\dfrac{5}{x}\) = \(\dfrac{20}{28}\)
c) \(2\dfrac{1}{3}\) : x = 7
d) \(\dfrac{-105}{12}\) < x < \(\dfrac{20}{7}\)
\(\left(-3\right).\dfrac{-5}{9}\)
\(\dfrac{-12}{5}-x=\dfrac{-3}{5}\)
\(\dfrac{-20}{x}=\dfrac{-3}{5}\)
Ghi kq thoi cx dc 
Bài3:Tìm x
a,\(\dfrac{x}{7}\)=\(\dfrac{6}{12}\) b,\(\dfrac{-5}{x}\)=\(\dfrac{20}{28}\) c,\(\dfrac{x-2}{8}\)=\(\dfrac{3}{4}\) d,\(\dfrac{x}{-5}\)=\(\dfrac{-5}{x}\)
các ban giúp mình nha, cảm ơn các bạn
\(\dfrac{-5}{12}\) : x = \(\dfrac{20}{-16}\)
Tìm x ϵ Z, biết:
\(\dfrac{5}{17}\)+\(\dfrac{-4}{9}\)+-\(\dfrac{20}{31}\)+\(\dfrac{12}{17}\)+\(\dfrac{-11}{-31}\)< \(\dfrac{x}{9}\) ≤ \(\dfrac{-3}{7}\)+\(\dfrac{7}{15}\)+\(\dfrac{4}{-7}\)+\(\dfrac{8}{15}\)+\(\dfrac{2}{3}\)
Tìm các số nguyên x,y biết:
a)\(\dfrac{6}{2x+1}=\dfrac{2}{7}\)
b) \(\dfrac{24}{7x-3}=\dfrac{-4}{25}\)
c) \(\dfrac{4}{x-6}=\dfrac{y}{24}=\dfrac{-12}{18}\)
d) \(\dfrac{-1}{5}\le\dfrac{x}{8}\le\dfrac{1}{4}\)
e) \(\dfrac{x+46}{20}=x\dfrac{2}{5}\)
f) \(y\dfrac{5}{y}=\dfrac{86}{y}\) ( \(x\dfrac{2}{5};y\dfrac{5}{y}\) là các hỗn số)
4. Tìm x biết:
\(\dfrac{1}{3}-\dfrac{1}{12}-\dfrac{1}{20}-\dfrac{1}{30}-\dfrac{1}{42}-\dfrac{1}{56}-\dfrac{1}{72}-\dfrac{1}{90}-\dfrac{1}{110}=x-\dfrac{5}{13}\)
Giải chi tiết giúp mình nha.
Tìm x :
a, \(\dfrac{3}{5}=\dfrac{-12}{x}\)
b, (x - 1) + (x - 2) + ( x - 3 ) + ... + (x -20 ) = 10
thực hiện phép tính
\(\dfrac{5}{12}+\dfrac{-7}{12}\)
\(\dfrac{1}{2}+\dfrac{-2}{3}\)
\(\dfrac{3}{5}-\dfrac{4}{3}\)
\(\dfrac{-15}{14}.\dfrac{21}{20}\)
Câu 1: Trong các phân số \(\dfrac{-11}{12}\) ; \(\dfrac{-20}{23}\) ; \(\dfrac{-27}{360}\); \(\dfrac{-5}{-7}\) phân số lớn nhất là:
A. \(\dfrac{-11}{12}\) ; B. \(\dfrac{-20}{23}\) ; C. \(\dfrac{-27}{360}\) ; D. \(\dfrac{-5}{-7}\)
Giúp mik với!!!!!!!!!!!!!!!
